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diff --git a/indra/newview/lltinygltfhelper.cpp b/indra/newview/lltinygltfhelper.cpp
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+++ b/indra/newview/lltinygltfhelper.cpp
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+/**
+ * @file   lltinygltfhelper.cpp
+ *
+ * $LicenseInfo:firstyear=2022&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2022, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "llviewerprecompiledheaders.h"
+
+#include "lltinygltfhelper.h"
+
+#include "llimage.h"
+#include "llviewertexture.h"
+#include "llviewertexturelist.h"
+
+void strip_alpha_channel(LLPointer<LLImageRaw>& img)
+{
+    if (img->getComponents() == 4)
+    {
+        LLImageRaw* tmp = new LLImageRaw(img->getWidth(), img->getHeight(), 3);
+        tmp->copyUnscaled4onto3(img);
+        img = tmp;
+    }
+}
+
+// copy red channel from src_img to dst_img
+// PRECONDITIONS:
+// dst_img must be 3 component
+// src_img and dst_image must have the same dimensions
+void copy_red_channel(LLPointer<LLImageRaw>& src_img, LLPointer<LLImageRaw>& dst_img)
+{
+    llassert(src_img->getWidth() == dst_img->getWidth() && src_img->getHeight() == dst_img->getHeight());
+    llassert(dst_img->getComponents() == 3);
+
+    U32 pixel_count = dst_img->getWidth() * dst_img->getHeight();
+    U8* src = src_img->getData();
+    U8* dst = dst_img->getData();
+    S8 src_components = src_img->getComponents();
+
+    for (U32 i = 0; i < pixel_count; ++i)
+    {
+        dst[i * 3] = src[i * src_components];
+    }
+}
+
+void LLTinyGLTFHelper::initFetchedTextures(tinygltf::Material& material,
+    LLPointer<LLImageRaw>& base_color_img,
+    LLPointer<LLImageRaw>& normal_img,
+    LLPointer<LLImageRaw>& mr_img,
+    LLPointer<LLImageRaw>& emissive_img,
+    LLPointer<LLImageRaw>& occlusion_img,
+    LLPointer<LLViewerFetchedTexture>& base_color_tex,
+    LLPointer<LLViewerFetchedTexture>& normal_tex,
+    LLPointer<LLViewerFetchedTexture>& mr_tex,
+    LLPointer<LLViewerFetchedTexture>& emissive_tex)
+{
+    if (base_color_img)
+    {
+        base_color_tex = LLViewerTextureManager::getFetchedTexture(base_color_img, FTType::FTT_LOCAL_FILE, true);
+    }
+
+    if (normal_img)
+    {
+        strip_alpha_channel(normal_img);
+        normal_tex = LLViewerTextureManager::getFetchedTexture(normal_img, FTType::FTT_LOCAL_FILE, true);
+    }
+
+    if (mr_img)
+    {
+        strip_alpha_channel(mr_img);
+
+        if (occlusion_img && material.pbrMetallicRoughness.metallicRoughnessTexture.index != material.occlusionTexture.index)
+        {
+            // occlusion is a distinct texture from pbrMetallicRoughness
+            // pack into mr red channel
+            int occlusion_idx = material.occlusionTexture.index;
+            int mr_idx = material.pbrMetallicRoughness.metallicRoughnessTexture.index;
+            if (occlusion_idx != mr_idx)
+            {
+                //scale occlusion image to match resolution of mr image
+                occlusion_img->scale(mr_img->getWidth(), mr_img->getHeight());
+
+                copy_red_channel(occlusion_img, mr_img);
+            }
+        }
+    }
+    else if (occlusion_img)
+    {
+        //no mr but occlusion exists, make a white mr_img and copy occlusion red channel over
+        mr_img = new LLImageRaw(occlusion_img->getWidth(), occlusion_img->getHeight(), 3);
+        mr_img->clear(255, 255, 255);
+        copy_red_channel(occlusion_img, mr_img);
+    }
+
+    if (mr_img)
+    {
+        mr_tex = LLViewerTextureManager::getFetchedTexture(mr_img, FTType::FTT_LOCAL_FILE, true);
+    }
+
+    if (emissive_img)
+    {
+        strip_alpha_channel(emissive_img);
+        emissive_tex = LLViewerTextureManager::getFetchedTexture(emissive_img, FTType::FTT_LOCAL_FILE, true);
+    }
+}
+
+LLColor4 LLTinyGLTFHelper::getColor(const std::vector<double>& in)
+{
+    LLColor4 out;
+    for (S32 i = 0; i < llmin((S32)in.size(), 4); ++i)
+    {
+        out.mV[i] = in[i];
+    }
+
+    return out;
+}
+
+const tinygltf::Image * LLTinyGLTFHelper::getImageFromTextureIndex(const tinygltf::Model & model, S32 texture_index)
+{
+    if (texture_index >= 0)
+    {
+        S32 source_idx = model.textures[texture_index].source;
+        if (source_idx >= 0)
+        {
+            return &(model.images[source_idx]);
+        }
+    }
+
+    return nullptr;
+}
+
+LLImageRaw * LLTinyGLTFHelper::getTexture(const std::string & folder, const tinygltf::Model & model, S32 texture_index, std::string & name)
+{
+    const tinygltf::Image* image = getImageFromTextureIndex(model, texture_index);
+    LLImageRaw* rawImage = nullptr;
+
+    if (image != nullptr &&
+        image->bits == 8 &&
+        !image->image.empty() &&
+        image->component <= 4)
+    {
+        name = image->name;
+        rawImage = new LLImageRaw(&image->image[0], image->width, image->height, image->component);
+        rawImage->verticalFlip();
+        rawImage->optimizeAwayAlpha();
+    }
+
+    return rawImage;
+}
+
+LLImageRaw * LLTinyGLTFHelper::getTexture(const std::string & folder, const tinygltf::Model & model, S32 texture_index)
+{
+    const tinygltf::Image* image = getImageFromTextureIndex(model, texture_index);
+    LLImageRaw* rawImage = nullptr;
+
+    if (image != nullptr &&
+        image->bits == 8 &&
+        !image->image.empty() &&
+        image->component <= 4)
+    {
+        rawImage = new LLImageRaw(&image->image[0], image->width, image->height, image->component);
+        rawImage->verticalFlip();
+    }
+
+    return rawImage;
+}
+
+bool LLTinyGLTFHelper::loadModel(const std::string& filename, tinygltf::Model& model_in)
+{
+    std::string exten = gDirUtilp->getExtension(filename);
+    
+    if (exten == "gltf" || exten == "glb")
+    {
+        tinygltf::TinyGLTF loader;
+        std::string        error_msg;
+        std::string        warn_msg;
+
+        std::string filename_lc = filename;
+        LLStringUtil::toLower(filename_lc);
+
+        // Load a tinygltf model fom a file. Assumes that the input filename has already been
+        // been sanitized to one of (.gltf , .glb) extensions, so does a simple find to distinguish.
+        bool decode_successful = false;
+        if (std::string::npos == filename_lc.rfind(".gltf"))
+        {  // file is binary
+            decode_successful = loader.LoadBinaryFromFile(&model_in, &error_msg, &warn_msg, filename_lc);
+        }
+        else
+        {  // file is ascii
+            decode_successful = loader.LoadASCIIFromFile(&model_in, &error_msg, &warn_msg, filename_lc);
+        }
+
+        if (!decode_successful)
+        {
+            LL_WARNS("GLTF") << "Cannot load, error: Failed to decode" << error_msg
+                << ", warning:" << warn_msg
+                << " file: " << filename
+                << LL_ENDL;
+            return false;
+        }
+
+        if (model_in.materials.empty())
+        {
+            // materials are missing
+            LL_WARNS("GLTF") << "Cannot load. File has no materials " << filename << LL_ENDL;
+            return false;
+        }
+        
+        return true;
+    }
+
+
+    return false;
+}
+
+bool LLTinyGLTFHelper::getMaterialFromModel(
+    const std::string& filename,
+    const tinygltf::Model& model_in,
+    S32 mat_index,
+    LLFetchedGLTFMaterial* material,
+    std::string& material_name)
+{
+    llassert(material);
+
+    if (model_in.materials.size() <= mat_index)
+    {
+        // materials are missing
+        LL_WARNS("GLTF") << "Cannot load Material, Material " << mat_index << " is missing, " << filename << LL_ENDL;
+        return false;
+    }
+
+    material->setFromModel(model_in, mat_index);
+
+    std::string folder = gDirUtilp->getDirName(filename);
+    tinygltf::Material material_in = model_in.materials[mat_index];
+
+    material_name = material_in.name;
+
+    // get base color texture
+    LLPointer<LLImageRaw> base_img = LLTinyGLTFHelper::getTexture(folder, model_in, material_in.pbrMetallicRoughness.baseColorTexture.index);
+    // get normal map
+    LLPointer<LLImageRaw> normal_img = LLTinyGLTFHelper::getTexture(folder, model_in, material_in.normalTexture.index);
+    // get metallic-roughness texture
+    LLPointer<LLImageRaw> mr_img = LLTinyGLTFHelper::getTexture(folder, model_in, material_in.pbrMetallicRoughness.metallicRoughnessTexture.index);
+    // get emissive texture
+    LLPointer<LLImageRaw> emissive_img = LLTinyGLTFHelper::getTexture(folder, model_in, material_in.emissiveTexture.index);
+    // get occlusion map if needed
+    LLPointer<LLImageRaw> occlusion_img;
+    if (material_in.occlusionTexture.index != material_in.pbrMetallicRoughness.metallicRoughnessTexture.index)
+    {
+        occlusion_img = LLTinyGLTFHelper::getTexture(folder, model_in, material_in.occlusionTexture.index);
+    }
+
+    LLPointer<LLViewerFetchedTexture> base_color_tex;
+    LLPointer<LLViewerFetchedTexture> normal_tex;
+    LLPointer<LLViewerFetchedTexture> mr_tex;
+    LLPointer<LLViewerFetchedTexture> emissive_tex;
+
+    // todo: pass it into local bitmaps?
+    LLTinyGLTFHelper::initFetchedTextures(material_in,
+        base_img, normal_img, mr_img, emissive_img, occlusion_img,
+        base_color_tex, normal_tex, mr_tex, emissive_tex);
+
+    if (base_color_tex)
+    {
+        base_color_tex->addTextureStats(64.f * 64.f, TRUE);
+        material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_BASE_COLOR] = base_color_tex->getID();
+        material->mBaseColorTexture = base_color_tex;
+    }
+    else
+    {
+        material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_BASE_COLOR] = LLUUID::null;
+        material->mBaseColorTexture = nullptr;
+    }
+
+    if (normal_tex)
+    {
+        normal_tex->addTextureStats(64.f * 64.f, TRUE);
+        material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_NORMAL] = normal_tex->getID();
+        material->mNormalTexture = normal_tex;
+    }
+    else
+    {
+        material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_NORMAL] = LLUUID::null;
+        material->mNormalTexture = nullptr;
+    }
+
+    if (mr_tex)
+    {
+        mr_tex->addTextureStats(64.f * 64.f, TRUE);
+        material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_METALLIC_ROUGHNESS] = mr_tex->getID();
+        material->mMetallicRoughnessTexture = mr_tex;
+    }
+    else
+    {
+        material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_METALLIC_ROUGHNESS] = LLUUID::null;
+        material->mMetallicRoughnessTexture = nullptr;
+    }
+
+    if (emissive_tex)
+    {
+        emissive_tex->addTextureStats(64.f * 64.f, TRUE);
+        material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_EMISSIVE] = emissive_tex->getID();
+        material->mEmissiveTexture = emissive_tex;
+    }
+    else
+    {
+        material->mTextureId[LLGLTFMaterial::GLTF_TEXTURE_INFO_EMISSIVE] = LLUUID::null;
+        material->mEmissiveTexture = nullptr;
+    }
+
+    return true;
+}